Weil-McLain UO-3 CV, Instruction Manual

Page: 12 / 24

12
Sequence of Operation - GeniSys 7505
Refer to the appliance manufacturer’s wiring diagram for
actual specifi cations.
Standby
: The burner is idle, waiting for a call for
heat.
Valve-On Delay
: The igniter and motor are on while
the control delays turning on the oil solenoid valve
for the programmed time.
Trial For Ignition
: The oil solenoid valve is
energized. A fl ame should be established within the
factory set trial for ignition time (lockout time).
Lockout
: The control has shut down for one of the
following safety reasons:
The trial for ignition (lockout) time expired
without
fl ame being established.
The cad cell detected fl ame at the end of the
Valve On Delay state.
To reset the control from lockout click the button
1-second.
NOTE:
A recurrence of the above failure
modes or a failed welded relay check
could cause the control to enter a
Hard
Lockout
state that must be reset only
by a quali fi ed service technician.
To reset from Hard Lockout, hold the
reset button for 15 seconds until the
yellow light turns on.
Ignition Carryover
: Once fl ame is
established, the igniter remains on for 10
additional seconds to ensure
fl ame stability.
Run
: The fl ame is sustained until the call for
heat is satis fi ed. The burner is then sent to
Motor-Off Delay, if applicable, or it is shut
down and sent to Standby.
Recycle
: If the fl ame is lost while the
burner is fi ring, the control shuts down the
burner, enters a 60 second recycle delay,
1.
2.
3.
4.
a.
b.
5.
6.
7.
and repeats the ignition sequence. The control will
continue to Recycle each time the
fl ame is lost, until
it reaches a pre-set time allotment. The control will
then go into Hard Lockout instead of recycle. This
feature prevents excessive accumulation of oil in
the appliance
fi ring chamber.
Motor-Off Delay
: If applicable, the oil solenoid
valve is turned off and the control delays turning the
motor off for the set motor-off delay time before the
control returns to standby.
Pump Prime:
The igniter and motor are on with the
oil solenoid valve energized for 4 minutes. During
Pump Prime mode, the cad cell is disregarded,
allowing the technician to prime the pump without
having to jumper the cad cell.
Cad Cell Resistance Indicator:
If the Beckett
7505 control is equipped with the GeniSys Display
Module, part 52067U, the cad cell resistance can
be selected and read on the LCD screen. Also, the
GeniSys Contractor Tool, part 52082U, can be used
for
this purpose.
If these are not available, the cad cell leads can
be unplugged from the control and the resistance
measured with a meter in the conventional way.
Conduct these tests with
fl ame present.
Flame Detection Range
Normal = 0 to 1600 ohms
Limited = 1600 ohms to lockout
8.
9.
10.
2
1
3
5
6
8
4
7
Standby
Motor-off delay
Valve-on delay
Trial for
ignition
Ignition carryover
Run
Lockout
Recycle
9
Pump
prime
Burner Control
The control can malfunction if it gets wet, leading to
accumulation of oil or explosive oil vapors.
Never install where water can
fl ood, drip or
condense on the control.
Never use a control that has been wet - replace it.
y
y
y
Can cause severe injury, death, or property damage.
Fire or Explosion Hazard
Section: Burner Control